Statement (D) is the most accurate.
Keeping in mind that WW1 was a huge disaster, countries like Britain were trying very hard to avoid it's nation into war, resulting in obtaining an appeasement with Germany. This obviously didn't work as France and Germany went into war. Britain had to go into war due to the alliance formed with France, called the Entent Cordial formed in the early 1900s (1904). With France and Britain into war, it also tangled Russia into war, also because of the alliance system.
